package com.example.project_out_in;

/**
 * @author Jose Davis Nidhin
 */

import java.io.IOException;
import java.util.List;

import android.content.Context;
import android.hardware.Camera;
import android.hardware.Camera.Size;
import android.util.Log;
import android.view.Display;
import android.view.Surface;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;

class Preview extends ViewGroup implements SurfaceHolder.Callback {
    private final String TAG = "Preview";

    SurfaceView mSurfaceView;
    SurfaceHolder mHolder;
    Size mPreviewSize;
    List<Size> mSupportedPreviewSizes;
    Camera mCamera;

  
	Preview(Context context, SurfaceView sv) {
        super(context);
        Log.d(TAG, "preview ****");
        mSurfaceView = sv;
//        addView(mSurfaceView);
       
        mHolder = mSurfaceView.getHolder();
        mHolder.addCallback(this);
        //mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }

    public void setCamera(Camera camera) {
    	mCamera = camera;
    	if (mCamera != null) {
    		mSupportedPreviewSizes = mCamera.getParameters().getSupportedPreviewSizes();
    		requestLayout();
    		Log.d(TAG, "preview ****b1");
    		// get Camera parameters
    		Camera.Parameters params = mCamera.getParameters();
    		Log.d(TAG, "preview ****b2");
    		List<String> focusModes = params.getSupportedFocusModes();
    		if (focusModes.contains(Camera.Parameters.FOCUS_MODE_AUTO)) {
    			// set the focus mode
    			params.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
    			// set Camera parameters
    			mCamera.setParameters(params);
    			Log.d(TAG, "preview ****b3");
    		}
    	}
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        // We purposely disregard child measurements because act as a
        // wrapper to a SurfaceView that centers the camera preview instead
        // of stretching it.
    	Log.d(TAG, "onMeasure");
        final int width = resolveSize(getSuggestedMinimumWidth(), widthMeasureSpec);
        final int height = resolveSize(getSuggestedMinimumHeight(), heightMeasureSpec);
        Log.d(TAG, "setMeasuredDimension");
        setMeasuredDimension(width, height);
        Log.d(TAG, "preview ****b4");
        if (mSupportedPreviewSizes != null) {
            mPreviewSize = getOptimalPreviewSize(mSupportedPreviewSizes, width, height);
            Log.d(TAG, "preview ****b5");
        }
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        if (changed && getChildCount() > 0) {
            final View child = getChildAt(0);
            Log.d(TAG, "preview ****b6");
            final int width = r - l;
            final int height = b - t;

            int previewWidth = width;
            int previewHeight = height;
            if (mPreviewSize != null) {
                previewWidth = mPreviewSize.width;
                previewHeight = mPreviewSize.height;
            }

            // Center the child SurfaceView within the parent.
          
            if (width * previewHeight > height * previewWidth) {
            	
                final int scaledChildWidth = previewWidth * height / previewHeight;
                child.layout((width - scaledChildWidth) / 2, 0,
                        (width + scaledChildWidth) / 2, height);
            } else {
            	
                final int scaledChildHeight = previewHeight * width / previewWidth;
                child.layout(0, (height - scaledChildHeight) / 2,
                        width, (height + scaledChildHeight) / 2);
            }
           /*
            child.layout(0, 0,
                    0, 300);
          */
            Log.d(TAG, "preview ****b7");
        }
    }

    public void surfaceCreated(SurfaceHolder holder) {
        // The Surface has been created, acquire the camera and tell it where
        // to draw.
        try {
            if (mCamera != null) {
                mCamera.setPreviewDisplay(holder);
                Log.d(TAG, "preview ****b99");
            }
        } catch (IOException exception) {
            Log.e(TAG, "IOException caused by setPreviewDisplay()", exception);
        }
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
        // Surface will be destroyed when we return, so stop the preview.
        if (mCamera != null) {
            mCamera.stopPreview();
        }
    }


    private Size getOptimalPreviewSize(List<Size> sizes, int w, int h) {
        final double ASPECT_TOLERANCE = 0.1;
        double targetRatio = (double) w / h;
        if (sizes == null) return null;

        Size optimalSize = null;
        double minDiff = Double.MAX_VALUE;

        int targetHeight = h;

        // Try to find an size match aspect ratio and size
        for (Size size : sizes) {
            double ratio = (double) size.width / size.height;
            if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue;
            if (Math.abs(size.height - targetHeight) < minDiff) {
                optimalSize = size;
                minDiff = Math.abs(size.height - targetHeight);
            }
        }

        // Cannot find the one match the aspect ratio, ignore the requirement
        if (optimalSize == null) {
            minDiff = Double.MAX_VALUE;
            for (Size size : sizes) {
                if (Math.abs(size.height - targetHeight) < minDiff) {
                    optimalSize = size;
                    minDiff = Math.abs(size.height - targetHeight);
                }
            }
        }
        return optimalSize;
    }

    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
    	if(mCamera != null) {
    		Camera.Parameters parameters = mCamera.getParameters();
    		parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
    		requestLayout();
    		
    		Log.d(TAG, "surfaceChanged");

    		//mCamera.setParameters(parameters);
    		
               // mCamera.stopPreview();
    		Context ctx = this.getContext();
           
    		Display display = ((WindowManager)ctx.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
    		
            if(display.getRotation() == Surface.ROTATION_0)
            {
                
                mCamera.setDisplayOrientation(90);
            }
           
            else if(display.getRotation() == Surface.ROTATION_90)
            {
                                       
            }
         
            else if(display.getRotation() == Surface.ROTATION_180)
            {
            	mCamera.setDisplayOrientation(270);           
            }

            else if(display.getRotation() == Surface.ROTATION_270)
            {
                
                mCamera.setDisplayOrientation(180);
            }
          
            mCamera.setParameters(parameters);
            //previewCamera();                   
    	
    		mCamera.startPreview();
    		Log.d(TAG, "end surfaceChanged");
    	}
    }

}
